Sessions, who has recused himself from the Russia investigation, first clashed with Franken at his confirmation hearing, during which he told the senator he had no contact with Russians during the 2016 election campaign.

During that same Oct. 18 hearing, the AG also said he was not aware of any communications between Trump campaign surrogates and Russians.

But documents relating to the indictment of former Trump foreign policy adviser George Papadopoulos appear to contradict Sessions on this as well.

The documents, released on Monday, state that Papadopoulos was present at a meeting with Sessions and President Donald Trump, in which Papadopoulos discussed arranging a meeting between Trump and Russian premier Vladimir Putin.

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This has prompted the letter from Franken to Sessions asking for clarification, saying that "once again" developments have "brought to light evidence that you failed to tell the truth" about his interactions with Russian operatives.

"This is an alarming pattern in which you, the nation’s top law enforcement officer, apparently failed to tell the truth, under oath, about the Trump team’s contacts with agents of Russia — a hostile foreign power that interfered with the 2016 election," Franken writes.

"I am deeply troubled that this newest revelation strongly suggests that the Senate – and the American public – cannot trust your word," he adds.

The letter mainly comprises questions that Franken wants answers to within the next two weeks, mainly looking for Sessions' own account of events to those described in the Papadopoulos indictment documents.